" When quarrel and strife arose among the immortals, if one of them that dwells on Olympus speaks false, Zeus sends Iris to bring the gods' great oath from far off in a golden jug, the celebrated golden water that drops from a high, sheer cliff and, far below the wide-pathed earth, flows from the holy river through dark night, a branch of Oceanus. A tenth part is her share: nine parts Oceanus winds round the earth and the broad back of the sea with his silver eddies, and falls into the brine, while that one part issues forth from the cliff, a great bane to the gods. "

― Hesiod , Theogony